# I am trying to create a custom function, how to multiply and sum two vectors in painless

**URL:** <https://discuss.elastic.co/t/i-am-trying-to-create-a-custom-function-how-to-multiply-and-sum-two-vectors-in-painless/296647>\
**Category:** Elasticsearch\
**Tags:** painless\
**Created:** [February 8, 2022, 5:46pm UTC](https://discuss.elastic.co/t/i-am-trying-to-create-a-custom-function-how-to-multiply-and-sum-two-vectors-in-painless/296647 "2022-02-08T17:46:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Marco\_Ramos](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/marco_ramos/32/101550_2.png) [@Marco\_Ramos](https://discuss.elastic.co/u/Marco_Ramos)\
**Post date:** [February 8, 2022, 5:46pm UTC](https://discuss.elastic.co/t/i-am-trying-to-create-a-custom-function-how-to-multiply-and-sum-two-vectors-in-painless/296647/1 "2022-02-08T17:46:44Z")

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vector a = [1,2,3,4,5]  
vector b=[2,2,2,2,2]

result =sum(a\*b)

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 8, 2022, 5:47pm UTC](https://discuss.elastic.co/t/i-am-trying-to-create-a-custom-function-how-to-multiply-and-sum-two-vectors-in-painless/296647/2 "2022-03-08T17:47:31Z")

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